Being a long-term Semantic Web aficionado, I have used Apache Jena with Eclipse several times for manipulating and parsing RDF models and originally installed it by downloading the Windows-compatible distro from http://jena.apache.org/download/index.cgi and and import the libs into my Eclipse project. I have recently found an Eclipse Library Plugin for Jena 2.0  and I was rather excited to be able to work with Jena  without fetching the latest Jena distro and adding it to your Build Path, but the excitement did not last long….The plugin is unfortunately for Jena 2.0 and it does not seem to be compatible with most recent Eclipse versions (e.g. Mars 4.5). Oh well, back to the known route, then!:)

(Related) Interesting resources:

Using Jena with Eclipse

JenaTools